Just got caught for $248.00 on a $1298 order. Sad part was, it was three items (Pascal boards) that could just as easily been shipped in two lots as one is for another member, and then no GST / import duty at all!
It's something to keep in mind - if you are buying parts makes sure the total including the shipping cost, comes in below $1,000.00 au. If not, you are quite likely better off splitting your order (that is, holding off on some until later and purchasing separately) as the postage will more often than not be much less than the 15% applicable to pinball stuff (5% import duty plus 10% GST, and then on top of that a $48.00 Customs fee).
This also needs to be kept in mind when considering "bulk orders" for members - in most cases it will cost 15% more to buy in bulk than separately (if the separate items are each under the $1,000.00 threshold, postage included).